KR20220074229A - System for photovoltaics - Google Patents

System for photovoltaics Download PDF

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KR20220074229A
KR20220074229A KR1020200162484A KR20200162484A KR20220074229A KR 20220074229 A KR20220074229 A KR 20220074229A KR 1020200162484 A KR1020200162484 A KR 1020200162484A KR 20200162484 A KR20200162484 A KR 20200162484A KR 20220074229 A KR20220074229 A KR 20220074229A
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power generation
power
generation efficiency
efficiency optimization
module
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KR1020200162484A
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KR102559055B1 (en
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이정흠
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한화솔루션 주식회사
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Priority to KR1020200162484A priority Critical patent/KR102559055B1/en
Priority to EP21898450.8A priority patent/EP4254783A1/en
Priority to US18/254,305 priority patent/US20240097452A1/en
Priority to AU2021385628A priority patent/AU2021385628A1/en
Priority to PCT/KR2021/016515 priority patent/WO2022114624A1/en
Publication of KR20220074229A publication Critical patent/KR20220074229A/en
Priority to KR1020230093894A priority patent/KR20230113256A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/38—Energy storage means, e.g. batteries, structurally associated with PV modules
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

본 발명은 태양광 발전 시스템에 관한 것으로, 다수의 PV모듈과, 상기 PV모듈 각각에 일대일 대응하여 설치되며, 인버터를 포함하여, 상기 PV모듈에서 생산된 전력을 AC 전력으로 변환하여 AC라인을 통해 전력망에 공급하는 발전효율 최적화부를 포함한다.The present invention relates to a photovoltaic power generation system, which is installed in a one-to-one correspondence with a plurality of PV modules and each of the PV modules, including an inverter, which converts the power produced by the PV module into AC power through an AC line It includes a power generation efficiency optimization unit for supplying the power grid.

Description

태양광 발전 시스템{System for photovoltaics}Solar power system {System for photovoltaics}

본 발명은 태양광 발전 시스템에 관한 것으로, 더 상세하게는 효율적인 관리가 가능한 태양광 발전 시스템에 관한 것이다.The present invention relates to a photovoltaic power generation system, and more particularly, to a photovoltaic power generation system capable of efficient management.

최근 아파트나 주택에 태양광 패널을 설치하고, 생산된 전력을 가정에서 이용하거나 전력망에 전력을 제공하는 사례가 증가하고 있다.Recently, cases of installing solar panels in apartments or houses and using the generated power at home or providing power to the power grid are increasing.

태양광 발전 시스템의 예로서, 등록특허 10-2034431호(2019년 10월 11일 등록, 태양광 패널의 최대 전력 발생 시스템)가 있다.As an example of a solar power generation system, there is Patent No. 10-2034431 (registered on October 11, 2019, the maximum power generation system of a solar panel).

위의 등록특허에 기재된 내용에 따르면 다수의 태양전지 패널 각각에 발전효율 최적화부(옵티마이저)를 부가하고, 하나의 인버터를 사용하여 각 태양전지 패널에서 생산된 직류전원을 교류전원으로 변환하는 역할을 한다.According to the contents described in the above registered patent, a power generation efficiency optimization unit (optimizer) is added to each of a plurality of solar cell panels, and a single inverter is used to convert DC power produced by each solar cell panel into AC power. do

발전효율 최적화부는 제어부로부터 출력전압이 태양전지 패널의 최대 전력 점 전압보다 높은 경우 출력전압 강압신호를 수신하고, 벅 모드로 동작시켜 출력전압을 낮추며, 최대 전력 점 전압보다 낮은 경우, 출력전압 승압신호를 생성하여 발전효율 최적화부로 전송하여, 부스트모드로 동작시켜 출력전압을 승압하는 동작을 한다.The generation efficiency optimization unit receives an output voltage step-down signal from the control unit when the output voltage is higher than the maximum power point voltage of the solar cell panel, operates in the buck mode to lower the output voltage, and when it is lower than the maximum power point voltage, the output voltage boost signal is generated and transmitted to the power generation efficiency optimization unit to operate in boost mode to boost the output voltage.

그러나 종래의 태양광 발전 시스템은, 하나의 인버터를 사용하기 때문에 인버터에 고장이 발생하면 모든 생산전력의 변환이 불가능한 문제점이 있었다.However, since the conventional solar power generation system uses one inverter, there is a problem in that it is impossible to convert all the generated power when the inverter fails.

또한, 위의 등록특허에 기재된 바와 같이 발전효율 최적화부는 직렬통신인 UAART, SPI, I2C를 포함하는 것으로, 제어기와 각 발전효율 최적화부간의 직렬통신을 통해 전압, 전류, 온도 및 동작지령과 같은 다양한 정보를 송수신하기 때문에 통신 속도가 상대적으로 낮은 문제점이 있었다.In addition, as described in the above registered patent, the generation efficiency optimization unit includes serial communication UAART, SPI, and I2C, and through serial communication between the controller and each generation efficiency optimization unit, various Since information is transmitted and received, there is a problem that the communication speed is relatively low.

도 1은 종래 태양광 발전 시스템의 구성도이다.1 is a block diagram of a conventional solar power generation system.

도 1을 참조하면 종래 태양광 발전 시스템은, 다수의 PV모듈(100)과, 상기 다수의 PV모듈(100) 각각에서 생산된 에너지를 최적화하는 발전효율 최적화부(200)와, 상기 발전효율 최적화부(200)와 통신을 수행함과 아울러 PV모듈(100)에서 생산된 에너지를 변환하여 배터리(400)에 저장하거나, 교류전원으로 변환하여 에너지 미터(500)를 통해 전력망(600)으로 공급하는 전력변환기(300)를 포함하여 구성될 수 있다.Referring to FIG. 1 , the conventional solar power generation system includes a plurality of PV modules 100 , a power generation efficiency optimization unit 200 for optimizing the energy produced by each of the plurality of PV modules 100 , and the optimization of the power generation efficiency In addition to performing communication with the unit 200, the energy produced by the PV module 100 is converted and stored in the battery 400, or converted into AC power and supplied to the power grid 600 through the energy meter 500. It may be configured to include a converter 300 .

상기 발전효율 최적화부(200)는 최대 전력 생산을 위한 최적화 기능을 수행함과 아울러 각 PV모듈(100)의 상태를 모니터링하여 전력변환기(300)로 제공하고, 전력변환기(300)의 제어에 따라 최적화를 수행한다.The power generation efficiency optimization unit 200 performs an optimization function for maximum power production, monitors the state of each PV module 100 and provides it to the power converter 300 , and is optimized according to the control of the power converter 300 . carry out

전력변환기(300)는 제어기(310)와, 인버터(320)를 포함하고 있으며, 필요에 따라 컨버터(330)가 부가될 수 있다. 컨버터(330)의 부가는 배터리(400)의 사용 여부에 따라 결정되는 것으로 한다.The power converter 300 includes a controller 310 and an inverter 320 , and a converter 330 may be added as necessary. The addition of the converter 330 is determined according to whether the battery 400 is used.

도면에서는 전력을 사용하는 가정의 부하는 생략했다.In the drawing, the load of the household using electric power is omitted.

각 PV모듈(100)에서 생성된 에너지는 PV라인(1)을 통해 발전효율 최적화부(200)로 제공되며, 각 발전효율 최적화부(200)는 각각에 1:1 대응되는 PV모듈(100)의 상태를 모니터링하고, 생산전력을 제어하는 최적화를 수행한다.The energy generated in each PV module 100 is provided to the power generation efficiency optimization unit 200 through the PV line 1, and each generation efficiency optimization unit 200 corresponds to each PV module 100 1:1. It monitors the state of the machine and performs optimization to control the power generation.

PV모듈(100)에서 생성된 에너지는 PV라인(1)을 통해서 전력변환기(300)로 제공되고, PV라인(1)을 통해 공급된 직류의 전기에너지는 인버터(320)를 통해 교류의 전기에너지로 변환되어 AC라인(3)을 통해 에너지 미터(500)로 제공되어 계측된 후, 전력망(600)으로 공급될 수 있다.The energy generated in the PV module 100 is provided to the power converter 300 through the PV line 1 , and the DC electrical energy supplied through the PV line 1 is AC electrical energy through the inverter 320 . converted into an energy meter 500 through the AC line 3 to be measured, and then supplied to the power grid 600 .

또한, 필요시 전력변환기(300)는 PV라인(1)을 통해 공급되는 각 PV모듈(100)의 에너지를 컨버터(330)를 통해 DC/DC 변환 후, 배터리 라인(2)을 통해 배터리(400)에 저장할 수 있다.In addition, if necessary, the power converter 300 converts the energy of each PV module 100 supplied through the PV line 1 to DC/DC through the converter 330, and then the battery 400 through the battery line 2 ) can be stored in

전력변환기(300)의 제어기(310)는 앞서 설명한 바와 같이 각 발전효율 최적화부(200)와 직렬 통신을 하거나, 상기 PV라인(1)을 통한 전력선통신(PLC, Power Line Communication)을 수행할 수 있다.As described above, the controller 310 of the power converter 300 performs serial communication with each generation efficiency optimization unit 200 or performs power line communication (PLC, Power Line Communication) through the PV line 1 . have.

이와 같은 종래의 구성에서 각 발전효율 최적화부(200)는 하나의 인버터(320)를 공유하기 때문에 인버터(320)에 고장이 발생하는 경우에는 전체 PV모듈(100)을 통해 생산된 전력을 전력망(600)에 공급할 수 없게되는 문제점이 있었다.In such a conventional configuration, since each power generation efficiency optimization unit 200 shares one inverter 320, when a failure occurs in the inverter 320, the power produced through the entire PV module 100 is transferred to the power grid ( 600), there was a problem that it could not be supplied.

이와 동일하게 각 발전효율 최적화부(200)는 하나의 DC/DC 컨버터를 공유하기 때문에 DC/DC 컨버터의 고장시에도 배터리(400)에 충전을 할 수 없는 문제점이 발생할 수 있다.In the same way, since each power generation efficiency optimization unit 200 shares one DC/DC converter, there may be a problem that the battery 400 cannot be charged even when the DC/DC converter fails.

상기와 같은 문제점을 감안한 본 발명이 해결하고자 하는 과제는, 전압의 변환을 위한 수단을 다중화하여, 특정 수단에 이상이 있는 경우에도 전력망에 에너지를 공급하거나 배터리에 충전을 수행할 수 있는 태양광 발전 시스템을 제공함에 있다.The problem to be solved by the present invention in consideration of the above problems is solar power generation that can supply energy to the power grid or charge a battery even if there is a problem in a specific means by multiplexing means for voltage conversion to provide a system.

상기와 같은 기술적 과제를 해결하기 위한 본 발명 태양광 발전 시스템은, 다수의 PV모듈과, 상기 PV모듈 각각에 일대일 대응하여 설치되며, 인버터를 포함하여, 상기 PV모듈에서 생산된 전력을 AC 전력으로 변환하여 AC라인을 통해 전력망에 공급하는 발전효율 최적화부를 포함한다.The present photovoltaic power generation system for solving the above technical problems is installed in a one-to-one correspondence with a plurality of PV modules and each of the PV modules, and including an inverter, converts the power produced by the PV module into AC power It includes a power generation efficiency optimization unit that converts and supplies it to the power grid through an AC line.

본 발명의 실시예에서, 상기 발전효율 최적화부는, 상기 PV모듈에서 생산된 전력을 변환하여 배터리 라인을 통해 배터리에 충전하는 컨버터를 더 포함할 수 있다.In an embodiment of the present invention, the power generation efficiency optimization unit may further include a converter that converts the power generated by the PV module and charges the battery through a battery line.

본 발명의 실시예에서, 상기 발전효율 최적화부는, 상기 PV모듈의 상태를 검출하는 모니터링부와, 상기 모니터링부에서 검출된 정보를 제어기의 제어부로 송신하는 통신 모듈부를 더 포함할 수 있다.In an embodiment of the present invention, the power generation efficiency optimization unit may further include a monitoring unit for detecting the state of the PV module, and a communication module unit for transmitting the information detected by the monitoring unit to the control unit of the controller.

본 발명의 실시예에서, 상기 발전효율 최적화부는, 상기 PV의 상태에 따라 RSD(Rapid Shut Down)을 수행하는 RSD 모듈부를 더 포함할 수 있다.In an embodiment of the present invention, the power generation efficiency optimization unit may further include an RSD module unit that performs Rapid Shut Down (RSD) according to the state of the PV.

본 발명의 실시예에서, 상기 제어부는, 상기 발전효율 최적화부와 상기 배터리 라인을 이용한 전력선 통신을 수행할 수 있다.In an embodiment of the present invention, the control unit may perform power line communication using the power generation efficiency optimization unit and the battery line.

본 발명은 발전효율 최적화부들 각각에 인버터를 포함하여 AC라인에 직접 연결되도록 설계함으로써, 특정 인버터에 고장이 발생한 경우에도 정상 동작하는 다른 발전효율 최적화부를 이용하여 전력망에 전력을 공급할 수 있는 효과가 있다.The present invention has the effect of supplying power to the power grid by using another power generation efficiency optimization unit that operates normally even when a failure occurs in a specific inverter by designing that each of the power generation efficiency optimization units includes an inverter and is directly connected to the AC line. .

아울러 본 발명은 발전효율 최적화부들에 배터리 라인을 연결하여, 배터리를 직접 충전함과 아울러 배터리 라인을 통해 제어기와 전력선 통신을 수행함으로써, DC/DC 컨버터의 일부에 고장이 발생한 경우에도 배터리에 에너지를 충전할 수 있는 효과가 있다.In addition, the present invention connects the battery line to the power generation efficiency optimization units to directly charge the battery and perform power line communication with the controller through the battery line, thereby supplying energy to the battery even when a part of the DC/DC converter fails. It has a charging effect.

도 1은 종래 태양광 발전 시스템의 구성도이다.
도 2는 본 발명 태양광 발전 시스템의 구성도이다.
도 3은 도 2에서 발전효율 최적화부의 블록 구성도이다.
도 4는 본 발명의 다른 실시예에 따른 태양광 발전 시스템의 구성도이다.1 is a block diagram of a conventional solar power generation system.
2 is a block diagram of the present invention solar power generation system.
3 is a block diagram of the power generation efficiency optimization unit in FIG. 2 .
4 is a block diagram of a solar power generation system according to another embodiment of the present invention.

본 발명의 구성 및 효과를 충분히 이해하기 위하여, 첨부한 도면을 참조하여 본 발명의 바람직한 실시 예들을 설명한다. 그러나 본 발명은 이하에서 개시되는 실시 예에 한정되는 것이 아니라, 여러가지 형태로 구현될 수 있고 다양한 변경을 가할 수 있다. 단지, 본 실시 예에 대한 설명은 본 발명의 개시가 완전하도록 하며, 본 발명이 속하는 기술분야의 통상의 지식을 가진 자에게 발명의 범주를 완전하게 알려주기 위하여 제공되는 것이다. 첨부된 도면에서 구성요소는 설명의 편의를 위하여 그 크기를 실제보다 확대하여 도시한 것이며, 각 구성요소의 비율은 과장되거나 축소될 수 있다.In order to fully understand the configuration and effect of the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be embodied in various forms and various modifications may be made. However, the description of the present embodiment is provided so that the disclosure of the present invention is complete, and to fully inform those of ordinary skill in the art to which the present invention belongs, the scope of the invention. In the accompanying drawings, components are enlarged in size from reality for convenience of description, and ratios of each component may be exaggerated or reduced.

'제1', '제2' 등의 용어는 다양한 구성요소를 설명하는데 사용될 수 있지만, 상기 구성요소는 위 용어에 의해 한정되어서는 안 된다. 위 용어는 하나의 구성요소를 다른 구성요소로부터 구별하는 목적으로만 사용될 수 있다. 예를 들어, 본 발명의 권리범위를 벗어나지 않으면서 '제1구성요소'는 '제2구성요소'로 명명될 수 있고, 유사하게 '제2구성요소'도 '제1구성요소'로 명명될 수 있다. 또한, 단수의 표현은 문맥상 명백하게 다르게 표현하지 않는 한, 복수의 표현을 포함한다. 본 발명의 실시 예에서 사용되는 용어는 다르게 정의되지 않는 한, 해당 기술분야에서 통상의 지식을 가진 자에게 통상적으로 알려진 의미로 해석될 수 있다.Terms such as 'first' and 'second' may be used to describe various elements, but the elements should not be limited by the above terms. The above terms may be used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a 'first component' may be termed a 'second component', and similarly, a 'second component' may also be termed a 'first component'. can Also, the singular expression includes the plural expression unless the context clearly dictates otherwise. Unless otherwise defined, terms used in the embodiments of the present invention may be interpreted as meanings commonly known to those of ordinary skill in the art.

도 2는 본 발명의 바람직한 실시예에 따른 태양광 발전 시스템의 구성도이다.2 is a block diagram of a photovoltaic power generation system according to a preferred embodiment of the present invention.

도 2를 참조하면 본 발명 태양광 발전 시스템은, 다수의 PV모듈(10)과, 다수의 PV모듈(10) 각각에 연결되어 발전효율을 최적화함과 아울러 PV모듈(10)에서 생산된 직류 전기에너지를 교류로 변환하여 에너지 미터(50)를 통해 전력망(60)에 공급하는 발전효율 최적화부(20)와, 상기 발전효율 최적화부(20)에서 검출된 모니터링 정보를 확인하고, 제어하는 제어기(30)를 포함한다.Referring to FIG. 2 , the photovoltaic power generation system of the present invention is connected to a plurality of PV modules 10 and each of the plurality of PV modules 10 to optimize power generation efficiency and direct current electricity produced by the PV module 10 A power generation efficiency optimization unit 20 that converts energy into alternating current and supplies it to the power grid 60 through an energy meter 50, and a controller that checks and controls the monitoring information detected by the power generation efficiency optimization unit 20 ( 30) is included.

이하, 상기와 같이 구성되는 본 발명 태양광 발전 시스템의 구성과 작용에 대하여 보다 상세히 설명한다.Hereinafter, the configuration and operation of the present invention solar power generation system configured as described above will be described in more detail.

먼저, PV모듈(10)의 수는 필요에 따라 결정될 수 있으며, 각 PV모듈(10)에는 발전효율 최적화부(20)가 부가된다. First, the number of PV modules 10 may be determined as needed, and a power generation efficiency optimization unit 20 is added to each PV module 10 .

상기 발전효율 최적화부(20)는 MLPE(Module Level Power Electronics)로 구현할 수 있으며, 도 2의 예에 적합한 발전효율 최적화부(20)의 구성을 도 3에 도시하였다.The power generation efficiency optimization unit 20 may be implemented as MLPE (Module Level Power Electronics), and the configuration of the power generation efficiency optimization unit 20 suitable for the example of FIG. 2 is shown in FIG. 3 .

즉, 발전효율 최적화부(20)는 인버터(21)를 포함하며, PV모듈(10)의 전압, 전류, 온도 등의 정보를 검출하는 모니터링부(23)와, 모니터링된 정보를 상기 제어기(30)로 제공할 수 있는 통신 모듈부(24)를 포함할 수 있다.That is, the power generation efficiency optimization unit 20 includes an inverter 21 , a monitoring unit 23 for detecting information such as voltage, current, and temperature of the PV module 10 , and a controller 30 for the monitored information. ) may include a communication module unit 24 that can be provided.

또한, 설비의 이상시 동작을 신속하게 차단하는 RSD(Rapid Shut Down) 모듈(22)을 포함할 수 있다.In addition, it may include a RSD (Rapid Shut Down) module 22 that quickly shuts off the operation in case of an abnormality of the facility.

상기 통신 모듈부(24)는 제어기(30)와 다양한 방식의 통신을 수행할 수 있으며, 이후에 설명되는 본 발명의 특징적인 전력선 통신 외에 직렬통신이 사용될 수 있다.The communication module unit 24 may perform various types of communication with the controller 30 , and serial communication may be used in addition to the characteristic power line communication of the present invention to be described later.

본 발명의 발전효율 최적화부(20)는 인버터(21)를 포함하여, PV모듈(10)에서 생산된 에너지를 PV라인(1)을 통해 공급받아 교류 에너지로 변환한 후, AC라인(3)을 통해 전력망(60)에 공급할 수 있다.The power generation efficiency optimization unit 20 of the present invention, including the inverter 21, receives the energy produced by the PV module 10 through the PV line 1, converts it into AC energy, and then the AC line (3) It can be supplied to the power grid 60 through.

이때, 에너지 미터(50)에 의해 공급 전력이 계측된다.At this time, the supplied power is measured by the energy meter 50 .

이상 설명한 구조에서 특정 발전효율 최적화부(20)의 인버터(21)에 고장이 발생한 경우에는, 고장이 발생한 인버터(21)를 포함하는 발전효율 최적화부(20)를 제외한 다른 발전효율 최적화부(20)는 전력의 변환이 정상적으로 이루어지기 때문에 전력망(60)에 전력을 공급하는 것이 가능하게 된다.In the above-described structure, when a failure occurs in the inverter 21 of the specific power generation efficiency optimization unit 20, other power generation efficiency optimization units 20 except for the generation efficiency optimization unit 20 including the faulty inverter 21 ), it becomes possible to supply power to the power grid 60 because the conversion of power is normally performed.

즉, 종래에는 각 발전효율 최적화부의 직류 전기에너지를 하나의 인버터를 사용하여 교류전력으로 변환하여 전력망에 공급하였으나, 본 발명은 각 발전효율 최적화부(20)에서 PV모듈(10)에서 생산된 직류전력을 교류전력으로 변환하여 직접 전력망(60)에 공급함으로써, 일부 인버터(21)에 이상이 발생한 경우에도 전력공급을 유지할 수 있는 특징이 있다.That is, in the prior art, the DC electric energy of each power generation efficiency optimization unit was converted into AC power using one inverter and supplied to the power grid, but in the present invention, each generation efficiency optimization unit 20 produces the direct current produced by the PV module 10 . By converting power into AC power and directly supplying it to the power grid 60 , power supply can be maintained even when an error occurs in some inverters 21 .

도 4는 본 발명의 다른 실시예에 따른 태양광 발전 시스템의 구성도이다.4 is a configuration diagram of a photovoltaic power generation system according to another embodiment of the present invention.

도 4를 참조하면 본 발명은, 발전효율 최적화부(20) 각각에 DC/DC 변환을 위한 컨버터(25)를 더 포함하여, 필요에 따라 PV모듈(10)에서 생산된 DC 전력을 배터리(32)의 충전에 적합한 DC 전력으로 변환하여 배터리(32)에 각각 충전할 수 있다.Referring to FIG. 4, the present invention further includes a converter 25 for DC/DC conversion in each of the power generation efficiency optimization unit 20, and converts the DC power produced by the PV module 10 to the battery 32, if necessary. ) can be converted into DC power suitable for charging the battery 32 , respectively.

이때, 배터리(32)는 제어기(30)에 포함되는 것으로 한다.At this time, it is assumed that the battery 32 is included in the controller 30 .

이하, 상기와 같이 구성된 본 발명의 다른 실시예에 따른 태양광 발전 시스템의 구성과 작용에 대하여 좀 더 상세히 설명한다.Hereinafter, the configuration and operation of the photovoltaic power generation system according to another embodiment of the present invention configured as described above will be described in more detail.

발전효율 최적화부(20)는 앞서 도 3을 참조하여 설명한 구성에 컨버터(25)를 더 포함하여 구성된다. 앞서 언급한 바와 같이 발전효율 최적화부(20)는 MLPE로 구현되는 것이며, 필요에 따라 기능 모듈을 추가할 수 있다.The power generation efficiency optimization unit 20 is configured to further include a converter 25 in the configuration described above with reference to FIG. 3 . As mentioned above, the power generation efficiency optimization unit 20 is implemented in MLPE, and a function module may be added as necessary.

상기 컨버터(25)는 DC/DC 컨버터이며, 각 PV모듈(10)에서 생산된 전력을 배터리(32)의 충전에 적합한 전력으로 변환한다.The converter 25 is a DC/DC converter, and converts power produced by each PV module 10 into power suitable for charging the battery 32 .

즉, PV라인(1)을 통해 공급되는 PV모듈(10)의 전력을 변환하여 배터리 라인(2)을 통해 배터리(32)에 직접 공급한다.That is, the power of the PV module 10 supplied through the PV line 1 is converted and directly supplied to the battery 32 through the battery line 2 .

따라서 발전효율 최적화부(20)들 중 일부에 포함된 컨버터(25)에 고장이 발생한 경우라도, 다른 정상 컨버터(25)를 포함하는 발전효율 최적화부(20)에 의해 배터리(32) 충전이 가능하게 된다.Accordingly, even when a failure occurs in the converter 25 included in some of the power generation efficiency optimization units 20 , the battery 32 can be charged by the power generation efficiency optimization unit 20 including the other normal converter 25 . will do

또한, 제어기(30)의 제어부(31)는 배터리 라인(2)을 통해 발전효율 최적화부(20)와 전력선통신을 수행할 수 있다.Also, the controller 31 of the controller 30 may perform power line communication with the power generation efficiency optimization unit 20 through the battery line 2 .

즉, 별도의 통신선의 연결 또는 PV라인의 확장 없이도, 배터리 라인(2)을 통한 통신이 가능하기 때문에 시스템의 설치가 용이하고, 비용을 줄일 수 있다.That is, since communication through the battery line 2 is possible without the connection of a separate communication line or the expansion of the PV line, the installation of the system is easy and the cost can be reduced.

아울러 배터리 라인(2)을 통한 전력선 통신은 발전효율 최적화부(20)들 사이의 통신도 가능하기 때문에 다양한 응용 및 확장이 가능한 특징이 있다.In addition, since the power line communication through the battery line 2 enables communication between the power generation efficiency optimization units 20, various applications and extensions are possible.

이상에서 본 발명에 따른 실시 예들이 설명되었으나, 이는 예시적인 것에 불과하며, 당해 분야에서 통상적 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 범위의 실시 예가 가능하다는 점을 이해할 것이다. 따라서, 본 발명의 진정한 기술적 보호 범위는 다음의 청구범위에 의해서 정해져야 할 것이다.Although the embodiments according to the present invention have been described above, these are merely exemplary, and those of ordinary skill in the art will understand that various modifications and equivalent ranges of embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be defined by the following claims.

10:PV모듈 20:발전효율 최적화부
21:인버터 25:컨버터
30:제어기 31:제어부
32:배터리 60:전력망10: PV module 20: power generation efficiency optimization unit
21: inverter 25: converter
30: controller 31: control unit
32: battery 60: power grid

Claims (5)

다수의 PV모듈; 및
상기 PV모듈 각각에 일대일 대응하여 설치되며, 인버터를 포함하여, 상기 PV모듈에서 생산된 전력을 AC 전력으로 변환하여 AC라인을 통해 전력망에 공급하는 발전효율 최적화부를 포함하는 태양광 발전 시스템.a plurality of PV modules; and
A photovoltaic power generation system comprising a power generation efficiency optimization unit installed in a one-to-one correspondence with each of the PV modules, including an inverter, to convert the power produced by the PV module into AC power and supply it to the power grid through an AC line. 제1항에 있어서,
상기 발전효율 최적화부는,
상기 PV모듈에서 생산된 전력을 변환하여 배터리 라인을 통해 배터리에 충전하는 컨버터를 더 포함하는 태양광 발전 시스템.According to claim 1,
The power generation efficiency optimization unit,
The solar power generation system further comprising a converter for converting the power produced by the PV module to charge the battery through a battery line. 제2항에 있어서,
상기 발전효율 최적화부는,
상기 PV모듈의 상태를 검출하는 모니터링부; 및
상기 모니터링부에서 검출된 정보를 제어기의 제어부로 송신하는 통신 모듈부를 더 포함하는 태양광 발전 시스템.3. The method of claim 2,
The power generation efficiency optimization unit,
a monitoring unit for detecting the state of the PV module; and
Solar power generation system further comprising a communication module for transmitting the information detected by the monitoring unit to the control unit of the controller. 제3항에 있어서,
상기 발전효율 최적화부는,
상기 PV의 상태에 따라 RSD(Rapid Shut Down)을 수행하는 RSD 모듈부를 더 포함하는 태양광 발전 시스템.4. The method of claim 3,
The power generation efficiency optimization unit,
The solar power generation system further comprising an RSD module unit for performing RSD (Rapid Shut Down) according to the state of the PV. 제3항에 있어서,
상기 제어부는,
상기 발전효율 최적화부와 상기 배터리 라인을 이용한 전력선 통신을 수행하는 것을 특징으로 하는 태양광 발전 시스템.4. The method of claim 3,
The control unit is
Solar power generation system, characterized in that performing power line communication using the power generation efficiency optimization unit and the battery line.
KR1020200162484A 2020-11-27 2020-11-27 System for photovoltaics KR102559055B1 (en)

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